|Classification and external resources|
|Specialty||Infectious disease, hematology|
Neutropenia, a subtype of leukopenia, refers to a decrease in the number of circulating neutrophil granulocytes, the most abundant white blood cells. The terms leukopenia and neutropenia may occasionally be used interchangeably, as the neutrophil count is the most important indicator of infection risk. This should not be confused with agranulocytosis.
The term is from Greek λευκός "white" and πενία "deficiency".